Lighting module, lighting device and taillight

ABSTRACT

A lighting device disclosed in an embodiment of the invention includes a substrate; a reflective member disposed on the substrate; a plurality of light emitting devices disposed on the substrate; a resin layer disposed on the reflective member; and an optical pattern portion having a plurality of concave portions concavely formed on an upper surface of the resin layer, wherein the plurality of light emitting devices is spaced apart in a first direction in which light is emitted, wherein the optical pattern portion includes a pattern portion in which a width of the concave portions is reduced from a position overlapping a center of each of the plurality of light emitting devices in the first direction, wherein the optical pattern portion includes a pattern portion in which a width of the concave portions is reduced from the center of the optical pattern portion toward both sides of a second direction.

TECHNICAL FIELD

An embodiment of the invention relates to a lighting module having aplurality of light sources, a lighting device and a tail lamp.

BACKGROUND ART

Lighting applications include vehicle lights as well as backlights fordisplays and signage. A light emitting device, for example, a lightemitting diode (LED), has advantages such as low power consumption,semi-permanent life, fast response speed, safety, and environmentalfriendliness compared to conventional light sources such as fluorescentlamps and incandescent lamps. These light emitting diodes are applied tovarious display devices, various lighting devices such as indoor oroutdoor lights. Recently, as a vehicle light source, a lamp employing alight emitting diode has been proposed. Compared with incandescentlamps, light emitting diodes are advantageous in that power consumptionis small. However, since a directivity angle of light emitted from thelight emitting diode is small, when the light emitting diode is used asa vehicle lamp, there is a demand for increasing the light emitting areaof the lamp using the light emitting diode.

DISCLOSURE Technical Problem

An embodiment of the invention may provide a lighting module and alighting device having a light source sealed in a resin layer and anoptical pattern portion on a surface of the resin layer. An embodimentof the invention may provide a lighting module and a lighting devicehaving a light source sealed in a resin layer and an optical patternportion in which concave portions recessed from a surface of the resinlayer toward the substrate are arranged.

An embodiment of the invention may provide a lighting module and alighting device in which concave portions are disposed from an upperperiphery of each of the light sources toward a lower surface of theresin layer.

Technical Solution

A lighting device according to an embodiment of the invention includes:a substrate; a reflective member disposed on the substrate; a pluralityof light emitting devices disposed on the substrate; a resin layerdisposed on the reflective member; and an optical pattern portion havinga plurality of concave portions formed concavely on an upper surface ofthe resin layer, wherein the plurality of light emitting devices arespaced apart from each other in a first direction in which light isemitted, and the optical pattern portion may include a pattern portionin which a width of the concave portions in the first direction at aposition overlapping a center of each of the plurality of light emittingdevices is reduced, and the optical pattern portion may include apattern portion in which a width of the concave portions toward bothsides of a second direction at the center of the optical pattern portionis reduced.

According to an embodiment of the invention, the pattern portion of theoptical pattern portion may include two or more pattern portions, andeach of the two or more pattern portions may have a plurality of concaveportions arranged the first and second directions. Each of the two ormore pattern portions may include a convex portion between the pluralityof concave portions. A width of the concave portion in a first patternportion adjacent to each of the light emitting devices among the two ormore pattern portions may be greater than a width of the convex portion.A width of the concave portion of a second pattern portion most spacedapart from the center of the light emitting device may be equal to orsmaller than a width of the convex portion. According to an embodimentof the invention, the plurality of concave portions disposed in theoptical pattern portion may have the same depth. The plurality ofconcave portions disposed in the optical pattern portion have differentdepths, and a depth of concave portions of the first pattern portiondisposed on the upper portion of the light emitting device may be thelargest among the concave portions, and a depth of concave portions ofthe second pattern portion disposed outside the optical pattern portionmay be the smallest among the concave portions. The concave portions mayhave a polygonal columnar shape or a columnar shape having a curvedsurface at a lower portion. A maximum length of the optical patternportion in the first direction may be smaller than a maximum length ofthe second direction. The optical pattern portion may be disposed oneach of the light emitting devices, and an area of the optical patternportion may be in a range of 6 to 18 times the area of the lightemitting device. The width of each of the concave portions may be in arange of 0.25 mm to 0.5 mm. The depth of the concave portions may be ina range of 0.25 mm to 0.65 mm. A tail light according to an embodimentof the invention is flexible and may include the lighting device.

Advantageous Effects

According to an embodiment of the invention, the light distributioncharacteristic of the vehicle lighting device may be improved. Since thelight reflected by the optical pattern portion on the surface of theresin layer is reduced in the lighting device, light distributionefficiency may be increased. The lighting device refracts the light bythe optical pattern portion on the surface of the resin layer, so thatan amount of emitted light may be increased. The lighting device mayprovide directionality for the distribution of light. The lightingdevice may provide a thinner thickness of the lighting module bydisposing the optical pattern portion on the resin layer. The lightingdevice may improve the reliability of lighting having an optical patternportion.

DESCRIPTION OF DRAWINGS

FIG. 1 is an example of a plan view of a lighting device according to anembodiment of the invention.

FIG. 2 is a partially enlarged view of the resin layer of FIG. 1 .

FIG. 3 is a view illustrating an example of a concave portion of anoptical pattern portion according to an embodiment of the invention.

FIG. 4 is a view showing a modified example of the concave portion ofthe optical pattern portion according to an embodiment of the invention.

FIG. 5 is an example of a side cross-sectional view of the lightingdevice of FIG. 1 in a first direction.

FIG. 6 is an enlarged view of region A1 of FIG. 5 .

FIG. 7 is a first example of the optical pattern portion of theinvention, and is a plan view of the region A2 of FIGS. 2 and 5 .

FIG. 8 is a cross-sectional side view taken along line A-A′ of FIG. 7 asregion A2 of FIG. 5 .

FIG. 9 is an example of a cross-sectional side view taken along lineB-B′ of FIG. 7 .

FIG. 10 is a view showing an example of a lighting module having a resinlayer having a second example of the optical pattern portion of theinvention.

FIG. 11 is a cross-sectional view taken along the line C-C′ of FIG. 10 .

FIG. 12 is a cross-sectional view taken along the line D-D′ of FIG. 10 .

FIG. 13 is a view showing an example of a lighting module having a resinlayer having a third example of the optical pattern portion of theinvention.

FIG. 14 is a cross-sectional view along E-E′ of FIG. 13 .

FIG. 15 is a cross-sectional view taken along the line F-F′ of FIG. 13 .

FIG. 16 is a fourth example of an optical pattern portion of theinvention, and is an example of a cross-sectional view taken along lineA-A′ side in FIG. 5 .

FIG. 17 is a fourth example of the optical pattern portion of theinvention, and is an example of a cross-sectional view taken along lineB-B′ in FIG. 5 .

FIG. 18 is a light distribution in examples 1, 2, and 3 of the opticalpattern portion according to an embodiment of the invention, and a viewshowing the light distribution of the comparative example.

FIG. 19 is a view showing an example of a plan view of a vehicle havingthe lighting device of the invention.

FIG. 20 is an example of a tail lamp of a vehicle to which the lightingdevice of FIG. 19 is applied.

BEST MODE

Hereinafter, preferred embodiments of the invention will be described indetail with reference to the accompanying drawings.

The technical spirit of the invention is not limited to some embodimentsto be described, and may be implemented in various other forms, and oneor more of the components may be selectively combined and substitutedfor use within the scope of the technical spirit of the invention. Inaddition, the terms (including technical and scientific terms) used inthe embodiments of the invention, unless specifically defined anddescribed explicitly, may be interpreted in a meaning that may begenerally understood by those having ordinary skill in the art to whichthe invention pertains, and terms that are commonly used such as termsdefined in a dictionary should be able to interpret their meanings inconsideration of the contextual meaning of the relevant technology.Further, the terms used in the embodiments of the invention are forexplaining the embodiments and are not intended to limit the invention.In this specification, the singular forms also may include plural formsunless otherwise specifically stated in a phrase, and in the case inwhich at least one (or one or more) of A and (and) B, C is stated, itmay include one or more of all combinations that may be combined with A,B, and C. In describing the components of the embodiments of theinvention, terms such as first, second, A, B, (a), and (b) may be used.Such terms are only for distinguishing the component from othercomponent, and may not be determined by the term by the nature, sequenceor procedure etc. of the corresponding constituent element. And when itis described that a component is “connected”, “coupled” or “joined” toanother component, the description may include not only being directlyconnected, coupled or joined to the other component but also being“connected”, “coupled” or “joined” by another component between thecomponent and the other component. In addition, in the case of beingdescribed as being formed or disposed “above (on)” or “below (under)” ofeach component, the description includes not only when two componentsare in direct contact with each other, but also when one or more othercomponents are formed or disposed between the two components. Inaddition, when expressed as “above (on)” or “below (under)”, it mayrefer to a downward direction as well as an upward direction withrespect to one element.

The lighting device according to the invention may be applied to variouslamp devices that require lighting, such as vehicle lamps, home lightingdevices, or industrial lighting devices. For example, when applied tovehicle lamps, it is applicable to headlamps, sidelights, side mirrors,fog lights, tail lamps, brake lights, daytime running lights, vehicleinterior lights, door scars, rear combination lamps, backup lamps, etc.The lighting device of the invention may be applied to indoor andoutdoor advertising devices, display devices, and various electricvehicle fields, and in addition, it may be applied to alllighting-related fields or advertisement-related fields that arecurrently developed and commercialized or that may be implementedaccording to future technological developments.

FIG. 1 is an example of a plan view of a lighting device according to anembodiment of the invention, FIG. 2 is a partially enlarged view of theresin layer of FIG. 1 , FIG. 3 is a view illustrating an example of aconcave portion of an optical pattern portion according to an embodimentof the invention, FIG. 4 is a view showing a modified example of theconcave portion of the optical pattern portion according to anembodiment of the invention, FIG. 5 is an example of a sidecross-sectional view of the lighting device of FIG. 1 in a firstdirection, FIG. 6 is an enlarged view of region A1 of FIG. 5 , FIG. 7 isa first example of the optical pattern portion of the invention, and isa plan view of the region A2 of FIGS. 2 and 5 , FIG. 8 is across-sectional side view taken along line A-A′ of FIG. 7 as region A2of FIG. 5 , and FIG. 9 is an example of a cross-sectional side viewtaken along line B-B′ of FIG. 7 .

Referring to FIGS. 1 to 6 , a lighting device 1000 according to anembodiment of the invention may include a light emitting device 300 anda resin layer 500 sealing the light emitting device 300 and having anoptical pattern portion 600. The lighting device 1000 may include thelight emitting device 300 and the substrate 100 disposed under the resinlayer 500. The lighting device 1000 may include a reflective member 400disposed between the substrate 100 and the resin layer 500. The lightingdevice 1000 may emit the light emitted from the light emitting device300 as surface light. The light emitting device 300 may be defined as apackage having an LED chip, a light source having an LED chip, or alight source emitting visible light. The lighting device 1000 may bedefined as a light emitting cell or a light source module. The lightingdevice 1000 may include one light emitting cell or a plurality of lightemitting cells on the substrate 100.

<Substrate 100>

Referring to FIGS. 1 to 6 , the substrate 100 may include a printedcircuit board (PCB). The substrate 100 may include, for example, atleast one of a resin-based printed circuit board (PCB), a PCB having ametal core, a flexible PCB, a ceramic PCB, or an FR-4 substrate. Whenthe substrate 100 is a metal core PCB having a metal layer disposed onthe bottom thereof, the heat dissipation efficiency of the lightemitting device 300 may be improved. The substrate 100 may beelectrically connected to the light emitting device 300. The substrate100 includes a wiring layer (not shown) thereon, and the wiring layermay be electrically connected to the light emitting device 300. When aplurality of the light emitting devices 300 are arranged on thesubstrate 100, the plurality of light emitting devices 300 may beconnected in series, parallel, or series-parallel by the wiring layer.The substrate 100 may function as a base member or a support memberdisposed under the light emitting device 300 and the resin layer 500.The upper surface of the substrate 100 may have an X-Y plane. The uppersurface of the substrate 100 may be flat or have a curved surface. Thethickness of the substrate 100 may be a vertical direction or a heightin the Z direction. Here, in the X-Y plane, the X direction may be afirst direction, and the Y direction may be a second direction. The Zdirection may be a direction orthogonal to the first and seconddirections. The plurality of light emitting devices 300 may be arrangedon the substrate 100 with a predetermined interval X1 in the firstdirection X. The substrate 100 may be provided in a straight or curvedbar shape in a long direction. The substrate 100 may include atranslucent material through which light is transmitted through theupper and lower surfaces. The light-transmitting material may include atleast one of polyethylene terephthalate (PET), polystyrene (PS), andpolyimide (PI).

The substrate 100 may include an insulating layer or a reflective layerfor protecting the pad and circuit pattern disposed thereon.

<Light Emitting Device 300>

Referring to FIGS. 1 to 6 , the light emitting device 300 is disposedalong at least a first direction X on the substrate 100, and emits lightin the first direction X. The light emitting devices 300 may be arrangedin N rows and/or M columns on the substrate 100. N and M may be 2 ormore. The plurality of light emitting devices 300 may be arranged in amatrix having regular intervals on the substrate 100 or may be arrangedin a form having irregular intervals. The light emitting device 300emits light having the highest intensity in one direction. The lightemitting device 300 may have an exit surface 381 through which light isemitted, and the exit surface 381 may be disposed, for example, in athird direction or in a vertical direction with respect to thehorizontal upper surface of the substrate 100. The exit surface 381 maybe a vertical plane, or may include a concave surface or a convexsurface. As shown in FIG. 6 , one or a plurality of conductive frames103 may be disposed on the lower portion of the light emitting device300, and the conductive frame 103 is a lead frame, facing the substrate100, and may be electrically connected to the pad of the substrate 100by a conductive bonding member 153. The conductive bonding member 103may be a solder material or a metal material. As another example, thelight emitting device 300 may be disposed as a first light emittingdevice from one end of the substrate 100 and a second light emittingdevice in an exit direction of the first light emitting device. Thefirst light emitting device and the second light emitting deviceirradiate light in the direction of the other end or the first directionof the substrate 100. That is, the first light emitting deviceirradiates light in the direction of the second light emitting device,and the second light emitting device irradiates light in the directionof the other end of the substrate 100 or the opposite side where thefirst light emitting device is disposed.

As shown in FIG. 6 , the light emitting device 300 may include a deviceincluding a light emitting chip 371 in a body or a package in which thelight emitting chip 371 is packaged. The light emitting chip 371 is anLED chip and may be molded in a body by a molding member. The exitsurface 381 may be a surface of the molding member. The molding membermay be made of a transparent resin material such as silicone or epoxy.The light emitting chip 371 may be provided as an LED chip that emits atleast one of blue, red, green, ultraviolet (UV), and infrared, and thelight emitting device 300 is white, blue, red, green, and infrared. Atleast one may emit light. The light emitting device 300 may be of a sideview type in which a bottom portion is electrically connected to thesubstrate 100, but is not limited thereto. As another example, the lightemitting device 300 may be an LED chip or a top view package.

The exit surface 381 of the light emitting device 300 may be disposed onat least one side of the light emitting device 300 rather than the uppersurface. The exit surface 381 may be a side adjacent to the substrate100 or a side perpendicular to the upper surface of the substrate 100among the side surfaces of the light emitting device 300. The exitsurface 381 is disposed on a side surface between the bottom surface andthe upper surface of the light emitting device 300 and emits light ofthe highest intensity in the first direction X.

Some of the light emitted through the exit surface 381 of the lightemitting device 300 travels in a direction parallel to the upper surfaceof the substrate 100, is reflected by the reflective member 400, or mayproceed in a direction of the upper surface of the resin layer 500. Thethickness of the light emitting device 300 may be, for example, 3 mm orless, for example, in the range of 0.8 mm to 2 mm. A length k1 of thelight emitting device 300 in the second direction may be 1.5 times ormore of a thickness of the light emitting device 300. In the lightdistribution of the light emitting device 300, the light directivityangle in ±Z direction may be wider than the light directivity angle in±Y direction. The light directivity angle of the light emitting device300 in the second direction Y may be 110 degrees or more, for example,120 degrees to 160 degrees or 140 degrees to 170 degrees. The lightdirectivity angle of the light emitting device 300 in the thirddirection Z may be 110 degrees or more, for example, 120 degrees to 140degrees.

<Reflective Member 400>

Referring to FIGS. 1 to 6 , the reflective member 400 may be a layerseparately disposed on the substrate 100 or a layer protecting the upperportion of the substrate 100. The reflective member 400 may be disposedbetween, for example, the substrate 100 and the resin layer 500. Thereflective member 400 may be provided in the form of a film having ametal material or a non-metal material. The reflective member 400 may beadhered to the upper surface of the substrate 100. The reflective member400 may have an area smaller than an area of the upper surface of thesubstrate 100. The reflective member 400 may be spaced apart from theedge of the substrate 100, and a resin layer 500 may be attached to thesubstrate 100 in a region where the reflective member is spaced apart.In this case, it is possible to prevent the edge portion of thereflective member 400 from peeling off. The reflective member 400 mayhave a dot-shaped reflective pattern disposed on its upper surface, butis not limited thereto. As shown in FIG. 6 , the reflective member 400may include an opening 410 in which a lower portion of the lightemitting device 300 is disposed. In the opening 410 of the reflectivemember 400, the upper surface of the substrate 100 is exposed and aportion to which the frame of the light emitting device 300 is bondedmay be disposed. The size of the opening 410 may be the same as orlarger than the size of the light emitting device 300, but is notlimited thereto. The reflective member 400 may be in contact with theupper surface of the substrate 100 or may be adhered between the resinlayer 500 and the substrate 100. Here, the reflective member 400 may beremoved when a highly reflective material is coated on the upper surfaceof the substrate 100. The reflective member 400 may be formed to have athickness smaller than that of the light emitting device 300. Thethickness of the reflective member 400 may include a range of 0.2mm±0.02 mm. The lower portion of the light emitting device 300 may passthrough the opening 410 of the reflective member 400 and an upperportion of the light emitting device 300 may protrude. The exit surface381 of the light emitting device 300 may be provided in a directionperpendicular to the upper surface of the reflective member 400.

The reflective member 400 may include a metallic material or anon-metallic material. The metallic material may include a metal such asaluminum, silver, or gold. The non-metallic material may include aplastic material or a resin material. The resin material may include areflective material, for example, a metal oxide such as TiO₂, Al₂O₃,SiO₂, in silicon or epoxy. The reflective member 400 may be implementedas a single layer or a multilayer, and light reflection efficiency maybe improved by such a layer structure. The reflective member 400according to an embodiment of the invention reflects incident light,thereby increasing the amount of light so that the light is emitteduniformly. As another example, the reflective member 400 may be removedfrom the substrate 100.

<Resin Layer 500>

The resin layer 500 may be disposed on the substrate 100. The resinlayer 500 may face or adhere to the substrate 100. The resin layer 500may be disposed on the entire or partial region of the upper surface ofthe substrate 100. An area of the lower surface of the resin layer 500may be the same as an area of the upper surface of the substrate 100, ormay be equal to or greater than 80% of an area of the upper surface ofthe substrate 100. The resin layer 500 may be formed of a transparentmaterial and may guide or diffuse light. The resin layer 500 includes aUV-curable resin material and may be used instead of a light guideplate, and the UV-curable resin material has an effect of convenientadjustment of refractive index and thickness. In addition, the resinlayer 500 uses an oligomer as a main material, and mixes IBOA, monomerfor dilution, and GMA, so that hardness, heat resistance, andtransmittance may be adjusted, and adhesion and oxidation prevention maybe suppressed. The resin layer 500 may contain a photo initiator and alight stabilizer to control curing and suppress discoloration. Since theresin layer 500 is provided as a layer for guiding light with a resin,it may be provided with a thinner thickness than in the case of glassand may be provided as a flexible plate. The resin layer 500 may emitthe point light emitted from the light emitting device 300 in the formof linear light or surface light. A bead (not shown) may be included inthe resin layer 500, and light may be diffused. Since the upper portionof the resin layer 500 is disposed on the light emitting device 300, thelight emitting device 300 may be protected and loss of light emittedfrom the light emitting device 300 may be reduced. The light emittingdevice 300 may be buried under the resin layer 500. The resin layer 500may be in contact with the surface of the light emitting device 300 andmay be in contact with the exit surface 381 of the light emitting device300. A portion of the resin layer 500 may be disposed in the opening 410of the reflective member 400. A portion of the resin layer 500 may be incontact with the upper surface of the substrate 100 through the opening410 of the reflective member 400. Accordingly, a portion of the resinlayer 500 is in contact with the substrate 100, thereby fixing thereflective member 400 between the resin layer 500 and the substrate 100.

The thickness of the resin layer 500 may be 5 mm or less, for example, 2mm to 5 mm. When the thickness of the resin layer 500 is thicker thanthe above range, luminous intensity or light blocking characteristicsmay be reduced, and it may be difficult to provide a flexible module dueto an increase in the module thickness. When the thickness of the resinlayer 500 is smaller than the above range, it is difficult to providesurface light having a uniform luminous intensity. The length of theresin layer 500 in the first direction X may be disposed along the firstdirection of the substrate 100, and the length of the second direction Ymay be disposed along the second direction of the substrate 100. Theresin layer 500 may be disposed in a range of 80% or more, for example,80% to 100% of the length of the substrate 100 in the first and seconddirections. Each side surface of the resin layer 500 may be disposed onthe same plane or adjacent to each side surface of the substrate 100.The resin layer 500 may be provided in a size to cover the plurality oflight emitting devices 300 or may be connected to each other. The resinlayer 500 may be divided into a size to cover each light emitting device300, and may be divided into light emitting cells having each lightemitting device 300 and each resin layer 500. The resin layer 500 mayinclude an optical pattern portion 600. The optical pattern portion 600reflects or refracts incident light to suppress hot spots.

<Optical Pattern Portion 600>

As shown in FIGS. 1, 2 and 5 , the optical pattern portion 600 may beformed in a concave pattern on the upper surface of the resin layer 500.The concave pattern may include concave portions 60 arranged to have apredetermined depth on the upper surface of the resin layer 500. Theoptical pattern portions 600 may be disposed on each of the upperportions of the light emitting devices 300, and may include concaveportions 60 formed from the upper surface of the resin layer 500 towardthe substrate 100. The convex portions 70 may be disposed between theconcave portions 60. Each of the plurality of optical pattern portions600 may be spaced apart from each other along a direction (e.g., X) inwhich the light emitting devices 300 are disposed. For example, aninterval X2 between the optical pattern portions 600 may be smaller thanthe interval X1 between the light emitting devices 300. Each of theoptical pattern portions 600 may be spaced apart from an outer sidesurface or an edge of the resin layer 500.

The first portion of the optical pattern portion 600 may be a regionoverlapping the light emitting device 300 in a vertical direction or athird direction Z. The second portion of the optical pattern portion 600may be a peripheral region of the first portion, and may be an upperregion from which light is emitted based on the first portion. Theplurality of optical pattern portions 600 may refract or reflect lightincident on top of each of the plurality of light emitting devices 300to suppress hot spots on each of the upper portions of the lightemitting devices 300. As shown in FIGS. 2 and 7 , each of the opticalpattern portions 600 may have a maximum length b2 in the seconddirection Y greater than a maximum length b1 in the first direction X.Each of the optical pattern portions 600 may be disposed in a regionhaving a radius of 10 mm or less in a long axis direction (e.g., asecond direction) from the center of each of the optical patternportions 600 and a radius of 6 mm or less in the minor axis direction.The maximum length b 1 of the optical pattern portion 600 in the firstdirection X may be 8 mm or more, for example, in the range of 8 mm to 12mm. The maximum length b2 of the optical pattern portion 600 in thesecond direction Y may be 10 mm or more, for example, in the range of 10mm to 20 mm or in the range of 12 mm to 20 mm. Each of the opticalpattern portions 600 may have a size corresponding to a characteristicof the light directivity angle of the light emitting device 300, thatis, the light directivity angle in the second direction Y with respectto the optical axis is larger than the directivity angle in the thirddirection Z. Accordingly, the optical pattern portion 600 mayeffectively refract or reflect light traveling in the third direction Zfrom the front of the light emitting device 300 with respect to theoptical axis, and may effectively refract or reflect light proceeding inthe second direction Y. Accordingly, the optical pattern portion 600 mayimprove the light diffusion efficiency by lowering the straightness ofthe incident light.

As shown in FIG. 2 , the width k2 of the first portion overlapping theupper portion of the light emitting device 300 of the optical patternportion 600 may be greater than the length k1 of the light emittingdevice 300. Accordingly, the light progressing upwards of the lightemitting device 300 may be effectively refracted and diffused in otherdirections. Here, when the light emitting devices 300 are arranged inthe first direction X, it may be defined as a first light emittingdevice and a second light emitting device. When the optical patternportions 600 are arranged in the first direction X, it may be defined asa first optical pattern portion and a second optical pattern portion.The first light emitting device emits light toward the front or the rearof the second light emitting device, and the second light emittingdevice emits light toward the front. The first optical pattern portioncovers the upper surface and the front upper portion of the first lightemitting device on the upper surface of the resin layer 500, and thesecond optical pattern portion covers the upper surface and the frontupper portion of the second light emitting device on the upper surfaceof the resin layer 500. The first and second optical pattern portionsmay refract or reflect light incident from each of the first and secondlight emitting devices to diffuse the light.

In the lighting device 1000 according to an embodiment of the invention,since the optical pattern portion 600 having an uneven pattern isdisposed on the surface of the resin layer 500, a structure including alayer for separately forming a light blocking member on the resin layer500 or an adhesive layer for bonding a layer having a light blockingmember to the resin layer may be removed. For light diffusion, adiffusion plate may be further provided on the resin layer 500, or aninner or outer lens may be further provided on the resin layer 500.Accordingly, it is possible to provide a thin thickness of the lightingdevice 1000, and the refracted light travels in the direction of thelight, thereby improving the distribution of the light.

As shown in FIGS. 1 to 4 , the optical pattern portion 600 includes aplurality of concave portions 60, and the top view shape of the concaveportion 60 may be a polygonal shape (e.g., a triangle, a square or apentagon), a circular shape or an elliptical shape. The upper surfacearea of each of the concave portions 60 may be provided with the samesize or different sizes. The upper surface area of each of the concaveportions 60 may be disposed to have the same size according to regions,and may be provided to have different sizes in different regions. Theconcave portions 60 may be spaced apart from each other by apredetermined interval, and the interval may be smaller than lengths ofthe concave portions 60 in the first and second directions X and Y.Interval between the concave portions 60 may be equal to each other. Theinterval between the concave portions 60 may include a region having aconstant interval and a region having a smaller or larger interval thanthe constant interval. The concave portions 60 may have the same ordifferent intervals in the first direction X and in the second directionY.

As shown in FIGS. 2 and 3 , in the optical pattern portion 600, concaveportions 60 and convex portions 70 may be alternately arranged in thefirst direction X. In the optical pattern portion 600, the concaveportions 60 and the convex portions 70 may be alternately arranged inthe second direction Y. A side cross-section of each of the concaveportions 60 may have a polygonal shape. The width of the concaveportions 60 in the first direction X and/or the second direction Y maybe smaller than the depth h1. The concave portions 60 may have acolumnar shape having a deep depth h1. The concave portion 60 may havean upper width and the same lower width. A bottom 6 of the concaveportion 60 may include a flat surface. The upper surface 7 of the convexportion 70 between the concave portions 60 may have a constant width ormay have different widths according to regions. The convex portions 70may be connected to each other, and the concave portions 60 may beprovided in a shape recessed in the lower surface direction in the innerregion of the convex portions 70. The concave portion 60 may reflect orrefract incident light, and may diffuse the incident light. The convexportion 70 may reflect or refract incident light, or guide it upward todiffuse it.

As shown in FIGS. 2 and 4 , a side cross-section of each of the concaveportions 60A of the optical pattern portion 600 may have a columnarshape. A lower portion of the concave portions 60A may have ahemispherical shape, and the bottom 6A may include a concave curvedsurface. The width of the concave portions 60A in the first directionand/or the second direction may be smaller than the depth h1. Theconcave portion 60A may have an upper width greater than a lower minimumwidth. The upper surface 7A of the convex portion 70A between theconcave portions 60A may have a constant width or may have differentwidths according to regions. The convex portions 70A may be connected toeach other, and the concave portions 60A may be provided in a shaperecessed in the lower surface direction within the region of the convexportion 70A. The curvature of the curved surface of the concave portion60A may be 0.08 or more, for example, in the range of 0.08 to 0.12. Itis possible to improve the emitting efficiency of light incident by thecurved surface having such a curvature. Here, the curvature of theconcave portion 60A may be a curvature between the bottom 6A and theside surface, or a curvature of a corner portion between the sidesurfaces in the concave portion 60A. The width of the concave portion60A may be 0.25 mm or more, for example, in the range of 0.25 mm to 0.45mm.

Referring to FIG. 4 , the angle at which the light incident on theconcave curved surface of the concave portion 60A is refracted and theangle at which the light is emitted are the same as in Equations 1 to 3for light extraction.

90−θ4=a sin(1.47 sin(90−θ3))  Equation 1

47.1°<90−θ3<90°  Equation 2

0°<90−θ3<47.1°  Equation 3

Here, 1.47 is the refractive index of the resin layer 500. The angle θ3is an angle of light incident with respect to a tangent passing throughthe curved surface of the concave portion 60A, and the angle θ4 is anangle of light refracted with respect to a tangent passing through thecurved surface of the concave portion 60A, and the angle θ5 is the anglebetween the light transmitted through the concave portion 60A and thehorizontal upper surface of the resin layer 500. The angle θ5 may be inthe range of 35±15 degrees. The condition of Equation 2 is an angle atwhich light incident on the concave portion 60A is totally reflected,and the transmittance of the light may be lowered. Here, the bottomcurvature of the concave portion 60A may be designed in consideration ofthe critical angle of the material of the resin layer 500. The conditionof Equation 3 is an angle at which light incident on the concave portion60A is transmitted, and the light may be refracted and emitted to theoutside. By the angle θ5 between the refracted and transmitted light andthe horizontal upper surface of the resin layer 500, the efficiency ofemitting light emitted from the light emitting device 300 in frontdirection may be increased, so that the light distribution of thelighting device may have directionality. That is, when the lightingdevice is disposed on the side of the vehicle lamp, the light emittedfrom the light emitting device 300 may be emitted at the angle θ5.Accordingly, the lighting device disposed on the rear side of thevehicle lamp may provide the directionality of the light distributionthat proceeds in the rear direction.

As shown in FIGS. 3 and 4 , the depth h1 of the concave portions 60 and60A of the optical pattern portion 600 may be 0.25 mm or more, forexample, in the range of 0.25 mm to 0.8 mm. The depth h1 of the concaveportions 60 and 60A of the optical pattern portion 600 may be constantor may have different depths depending on the regions. For example, whenthe concave portions 60 and 60A have different depths h1 depending onthe regions, the first region adjacent to the light emitting device 300is deep and the second region(s) farther from the light emitting device300 may have a smaller depth than a depth of the first region. Theconcave portions 60 and 60A may be formed by etching or may be formed bya molding process of the resin layer 500.

FIGS. 7 to 9 are views showing the optical pattern portion according tothe first example of the invention.

Referring to FIGS. 7 to 9 , in the optical pattern portion 600, themaximum length b2 in the second direction Y may be greater than themaximum length b 1 in the first direction X, for example, the maximumlength b2 in the second direction Y may be 120% or more, for example,120% to 180% of the maximum length b1 in the first direction X. The areaof the region connecting the outermost patterns of the optical patternportion 600 may be 6 times or more, for example, 6 times to 18 times theupper surface area of the light emitting device 300. Accordingly, theoptical pattern portion 600 may cover the upper portion and the frontregion of the light emitting device 300 to reflect or refract theincident light. In the optical pattern portion 600, widths w1, w2, w3,and w4 of the plurality of pattern portions 610, 620, 630, and 640arranged in the first direction X may be different from each other. Theplurality of pattern portions 610, 620, 630, and 640 may extend in thesecond direction Y. For example, the plurality of pattern portions 610,620, 630, and 640 may be disposed at the same depth h1, and the pitchesP1, P2, P3, and P4 between the concave portions 61, 62, 63, and 64adjacent in the first and second directions X and Y may be the same ormay become wider as a distance from the exit surface 381 of the lightemitting device 300 increases. Each of the plurality of pattern portions610, 620, 630 and 640 includes concave portions 61, 62, 63, 64 andconvex portions 71, 72, 73, 74, and the concave portions 61, 62, 63, 64and the convex portions 71, 72, 73, and 74 may be alternately disposed.Intermediate convex portions 77, 78, and 79 between the plurality ofpattern portions 610, 620, 630, and 640 are larger than at least two ofthe widths w1, w2, w3 and w4 of the adjacent concave portions 61, 62, 63and 64, and may be equal to or greater than the width of at least one ofthe widths of the adjacent convex portions 71, 72, 73, and 74.

The optical pattern portion 600 may disposed in the order of a firstpattern portion 610, a second pattern portion 620, a third patternportion 630, and a fourth pattern portion 640 in a first direction Xfrom the center of the position where the light emitting device 300 isplaced. The optical pattern portion 600 may be disposed in the order ofa first pattern portion 610, a second pattern portion 620, a thirdpattern portion 630 and a fourth pattern portion 640 on both sides inthe second direction Y from the position where the light emitting device300 is placed or the center of the optical pattern portion 600.Intermediate convex portions 77, 78, and 79 may be disposed between thefirst to fourth pattern portions 610, 620, 630 and 640, respectively. Ineach of the first to fourth pattern portions 610, 620, 630 and 640,concave portions 61, 62, 63, 64 and convex portions 71, 72, 73 and 74may be alternately disposed. The first pattern portion 610 includes aplurality of first concave portions 61 and a plurality of first convexportions 71, and the width w 1 of the first concave portion 61 may begreater than a width of the first convex portion 71 disposed between thefirst concave portions 61. The second pattern portion 620 includes aplurality of second concave portions 62 and a plurality of second convexportions 72, and the width w2 of the second concave portion 62 may begreater than a width of the second convex portion 72 disposed betweenthe second concave portions 62.

The third pattern portion 630 includes a plurality of third concaveportions 63 and a plurality of fourth convex portions 73, and the widthw3 of the third concave portion 63 may be smaller than a width of thethird convex portion 73 disposed between the third concave portions 63.The fourth pattern portion 640 includes a plurality of fourth concaveportions 64 and at least one fourth convex portion 74, and the width ofthe fourth concave portion 64 may be smaller than a width of the fourthconvex portion 74 disposed between the fourth concave portion 64.

Widths w1, w2, w3 and w4 of the first to fourth concave portions 61, 62,63, and 64 may gradually decrease in the first direction X based on aposition overlapping the center of the light emitting device 300. Widthsw1, w2, w3 and w4 of the first to fourth concave portions 61, 62, 63,and 64 may gradually decrease from a position overlapping with thecenter of the light emitting device 300 or from the center of theoptical pattern portion 600 toward both sides of the second direction Y.For example, the width of each of the first to fourth concave portions61, 62, 63, and 64 may satisfy the following condition: w1>w2>w3>w4. Thewidth w1 is 0.4 mm or more, for example, in the range of 0.4 mm to 0.6mm, the width w2 is less than 0.4 mm, for example, in the range of 0.32mm to 0.39 mm, and the width w3 is 0.3 mm or less, for example, in therange of 0.29 mm to 0.38 mm, and the width w4 may be 0.2 mm or more, forexample, in the range of 0.2 mm to 0.28 mm. The width w1 of the firstconcave portion 61 may be at least twice the width w4 of the fourthconcave portion 64. The widths d1, d2, and d3 of the intermediate convexportions 77, 78, and 79 may satisfy the following condition: d1<d2<d3,and may be a minimum of 0.01 mm or more and a maximum of 0.5 mm or less.That is, the maximum width d3 may be in the range of 0.4 mm to 0.5 mm,and the minimum width d1 may be in the range of 0.01 to 0.2 mm. Thisminimum width d1 may be a range in which concave portions between theconvex portions 77 may be etched or formed.

The depth h1 of the first to fourth concave portions 61, 62, 63, and 64may be 0.25 mm or more, for example, in the range of 0.25 mm to 0.35 mm.When an area of the upper surface of the optical pattern portion 600 is100%, the area of the upper surface of the first pattern portion 610 maybe in the range of 40%±5% compared to an area of the upper surface ofthe optical pattern portion 600, and, an area of the upper surface ofthe second pattern portion 620 may be in the range of 25%±4% compared tothe area of the upper surface of the optical pattern portion 600, and anarea of the upper surface of the third pattern portion 630 may be in therange of 20%±3% compared to the area of the optical pattern portion 600,and an area of the upper surface of the fourth pattern portion 640 maybe in the range of 15%±3% compared to the area of the upper surface ofthe optical pattern portion 600.

In the first example, the depth h1 of the optical pattern portion 600having the plurality of pattern portions 610, 620, 630, and 640 is thesame, and the pattern portions having the concave portions 61, 62, 63,and 64 farther away from an overlapping position with the center of thelight emitting device 300 may be provided with a gradually smallerwidth. Accordingly, an area of the concave portion of the first patternportion 610 is the largest in the region adjacent to the light emittingdevice 300, and an area of the concave portion may be reduced as theregion is farther from the light emitting device 300, so that patternscapable of diffusing light in proportion to the light intensity may bedisposed.

FIGS. 10 to 12 are views illustrating an optical pattern portionaccording to a second example.

Referring to FIGS. 10 to 12 , in the optical pattern portion 600Adisposed on the resin layer 500, the maximum length b4 in the seconddirection Y may be equal to or greater than the maximum length b3 in thefirst direction X, for example, the maximum length b4 in the seconddirection Y may be 200% or more, for example, in the range of 200% to330% of the maximum length b3 in the first direction X. The maximumlength b3 in the first direction X may be equal to or greater than thelength k1 (in FIG. 2 ) of the light emitting device 300. For example,the maximum length b3 in the first direction X may be 3.5 mm or less,for example, in the range of 2.5 mm to 3.5 mm, and the maximum length b4in the second direction Y may be 7 mm or more, for example, in the rangefrom 7 mm to 9 mm. The area of the region connecting the outermostpatterns of the optical pattern portion 600 may be one or more times,for example, one to three times the area of the upper surface of thelight emitting device 300. Accordingly, the optical pattern portion 600Amay cover the upper portion and the front region of the light emittingdevice 300 to reflect or refract the incident light.

In the optical pattern portion 600A, widths w1 and w2 of the pluralityof pattern portions 610 and 620 arranged in the first direction X may bedifferent from each other. The plurality of pattern portions 610 and 620may extend in the second direction Y. For example, the plurality ofpattern portions 610 and 620 may be disposed to have the same depth h2as each other, and the pitches p1 and p2 between the concave portions 62adjacent in the first and second directions X and Y may be the same ormay be gradually increased. Each of the plurality of pattern portions610 and 620 includes concave portions 61 and 62 and convex portions 71and 72, and the concave portions 61 and 62 and the convex portions 71and 72 may be alternately disposed. The intermediate convex portion 77between the plurality of patterns may be greater than the widths w1 andw2 of the adjacent concave portions 61 and 62, and may be equal to orgreater than the width of at least one of the adjacent convex portions71. The optical pattern portion 600A has a first pattern portion 610 anda second pattern portion 620 disposed in a first direction, and anintermediate convex portion 77 may be disposed between each of the firstpattern portions 610 and each of the second pattern portions 620. Theconcave portions 61 and 62 and the convex portions 71 and 72 may bealternately disposed in each of the first and second pattern portions610 and 620.

The first pattern portion 610 includes a plurality of first concaveportions 61 and a plurality of first convex portions 71, and the widthw1 of the first concave portion 61 may be greater than a width of thefirst convex portions 71 disposed between the first concave portions 61.The second pattern portion 620 includes a plurality of second concaveportions 62 and a plurality of second convex portions 72, and the widthw2 of the second concave portion 62 may be greater than a width of thesecond convex portion 72 disposed between the second concave portions62.

Widths w1 and w2 of the first concave portion 61 and the second concaveportion 62 in the first direction X may be gradually smaller based on aposition overlapping the center of the light emitting device 300. Thewidths (w1>w2) of the first concave portion 61 and the second concaveportion 62 arranged toward both sides in the second direction Y may begradually decreased from a position overlapping the center of the lightemitting device 300 or from the center of the optical pattern portion600A. For example, the width of each of the first and second concaveportions 61 and 62 may satisfy the following condition: w1>w2. The widthw1 may be 0.4 mm or more, for example, in the range of 0.4 mm to 0.6 mm,and the width w2 may be less than 0.4 mm, for example, in the range of0.25 mm to 0.39 mm. The width w1 of the first concave portion 61 may beless than or equal to twice the width w2 of the second concave portion62. The width d1 of the intermediate convex portion 77 may be in therange of 0.01 mm to 0.5 mm, and may be larger than the widths of thefirst and second convex portions 71 and 72. The depth h2 of the firstand second concave portions 61 and 62 may be 0.4 mm or more, forexample, in the range of 0.4 mm to 0.5 mm. When an area of the uppersurface of the optical pattern portion 600A is 100%, the upper surfacearea of the first pattern portion 610 may be in the range of 80%±5%compared to an area of the upper surface of the optical pattern portion600A, and an area of the upper surface of the second pattern portion 620may be in the range of 20%±4% compared to an area of the upper surfaceof the optical pattern portion 600A.

In the second example, the depth h2 of the optical pattern portion 600Ahaving the plurality of pattern portions 610 and 620 is deeper than thedepth h1 of the first example and is equal to each other, and may begradually reduced as the distance from the overlapping position with thecenter of the light emitting device 300 increases. Accordingly, an areaof the first concave portion 61 of the pattern portions 610 and 620 isthe largest in a region adjacent to the light emitting device 300, andthe area of the second concave portion 62 may be reduced as the regionis farther away the light emitting device 300, so that patterns capableof diffusing light in proportion to the light intensity may be disposed.

FIGS. 13 to 15 are views illustrating an optical pattern portionaccording to a third example.

Referring to FIGS. 13 to 15 , in the optical pattern portion 600Bdisposed on the resin layer 500, the maximum length b6 in the seconddirection Y may be greater than the maximum length b5 in the firstdirection X, for example, the maximum length b6 in the second directionY may be 100% or more than the maximum length b5 in the first directionX, for example, in the range of 100% to 150%. The maximum length b5 inthe first direction X may be 80% or more, for example, 80% to 110% ofthe length k1 (in FIG. 2 ) of the light emitting device 300. Forexample, the maximum length b5 in the first direction X may be in therange of 2.5 mm or less, for example, 1.8 mm to 2.5 mm, and the maximumlength b6 in the second direction Y is 7 mm or more, for example, in therange from 7 mm to 9 mm. The area of the region connecting the outermostpatterns of the optical pattern portion 600B may be 0.5 times or more,for example, in the range of 0.5 times to 1.5 times an area of the uppersurface of the light emitting device 300. Accordingly, the opticalpattern portion 600B may cover an upper portion of the light emittingdevice 300 and a front region thereof to reflect or refract incidentlight.

In the optical pattern portion 600B, widths w1 and w2 of the pluralityof pattern portions 610 and 620 arranged in the first direction X may bedifferent from each other. The plurality of pattern portions 610 and 620may extend in the second direction Y. For example, the plurality ofpattern portions 610 and 620 may be disposed to have the same depth h3as each other, and the pitch p1 between the concave portions 62 adjacentin the first and second directions X and Y may be the same. Each of theplurality of pattern portions 610 and 620 includes concave portions 61and 62 and convex portions 71 and 72, and the concave portions 61 and 62and the convex portions 71 and 72 may be alternately disposed. Theintermediate convex portion 77 between the plurality of pattern portions610 and 620 may be smaller than the width w1 of at least one of theadjacent concave portions 61 and 62 and greater than the width of theadjacent convex portions 71 and 72. The optical pattern portion 600B hasa first pattern portion 610 and a second pattern portion 620 disposed ina first direction, and an intermediate convex portion 77 may be disposedbetween each of the first and second pattern portions 610 and 620. Theconcave portions 61 and 62 and convex portions 71 and 72 may bealternately disposed in the first and second directions. The firstpattern portion 610 includes a plurality of first concave portions 61and a plurality of first convex portions 71, and the width w1 of thefirst concave portion 61 may be greater than a width of the first convexportion 71 disposed between the first concave portions 61. The secondpattern portion 620 includes a plurality of second concave portions 62and a plurality of second convex portions 72, and the width w2 of thesecond concave portion 62 may be equal to or different from a width ofthe second convex portion 72 disposed between the second concaveportions 62. Widths w1 and w2 of the first concave portion 61 and thesecond concave portion 62 in the first direction X may be graduallysmaller based on a position overlapping the center of the light emittingdevice 300. The width (w1>w2) of first concave portion 61 and the secondconcave portion 62 arranged toward both sides in the second direction Yfrom a position overlapping the center of the light emitting device 300or from the center of the optical pattern portion 600B may graduallydecrease. For example, the width of each of the first and second concaveportions 61 and 62 may satisfy the following conduction: w1>w2. Thewidth w1 may be 0.4 mm or more, for example, in the range of 0.4 mm to0.6 mm, and the width w2 may be less than 0.4 mm, for example, in therange of 0.25 mm to 0.39 mm. The width w1 of the first concave portion61 may be less than or equal to twice the width w2 of the second concaveportion 62. The width d1 of the intermediate convex portion 77 may be inthe range of 0.01 mm to 0.5 mm, and may be greater than the widths ofthe first and second convex portions 71 and 72.

The depth h3 of the first and second concave portions 61 and 62 may be0.55 mm or more, for example, in the range of 0.55 mm to 0.65 mm. Whenan area of the upper surface of the optical pattern portion 600B is100%, an area of the upper surface of the first pattern portion 610 maybe in the range of 85%±5% compared to the area of the upper surface ofthe optical pattern portion 600B, and an area of the upper surface ofthe second pattern portion 620 may be in the range of 15%±4% compared tothe area of the upper surface of the optical pattern portion 600B.

In the third example, the depth h3 of the optical pattern portion 600Bhaving the plurality of pattern portions 610 and 620 is deeper than thedepth h2 of the second example and is equal to each other, and may begradually reduced as the distance from overlapping position with thecenter of the light emitting device 300 increases. Accordingly, an areaof the first concave portion 61 of the pattern portions 610 and 620 isthe largest in the region adjacent to the light emitting device 300, andthe area of the second concave portion 62 may be reduced as the regionis farther away the light emitting device 300, so that patterns capableof diffusing light in proportion to the light intensity may be disposed.

FIGS. 16 and 17 are views illustrating an optical pattern portionaccording to a fourth example.

Referring to FIGS. 2, 16 and 17 , in the optical pattern portion 600C,the maximum length b2 in the second direction Y may be greater than themaximum length b 1 in the first direction X, for example, the maximumlength b2 in the second direction Y may be 120% or more, for example,120% to 180% of the maximum length b1 in the first direction X. An areaof the region connecting the outermost patterns of the optical patternportion 600C may be 6 times or more, for example, 6 to 18 times an areaof the upper surface of the light emitting device 300. Accordingly, theoptical pattern portion 600C may cover the upper portion and the frontregion of the light emitting device 300 to reflect or refract theincident light.

In the optical pattern portion 600C, widths w1, w2, w3, and w4 of theplurality of pattern portions 610, 620, 630, and 640 arranged in thefirst direction X may be different from each other. The plurality ofpattern portions 610, 620, 630, and 640 may extend in the seconddirection. For example, the plurality of pattern portions 610, 620, 630,and 640 may have a different depths h1, h2, h3 and h4, and the pitchesP1, P2, P3, and P4 between the concave portions 62 adjacent in the firstand second directions may be different from each other.

Each of the plurality of pattern portions 610, 620, 630 and 640 includesconcave portions 61, 62, 63, 64 and convex portions 71, 72, 73, 74, andthe concave portions 61, 62, 63, 64 and the convex portions 71, 72, 73,and 74 may be alternately disposed. The intermediate convex portions 77,78, and 79 between the plurality of pattern portions 610, 620, 630, and640 may have a smaller widths d1, d2, and d3 than the widths w1 and w2of the adjacent first and second concave portions 61 and 62, and mayhave widths d1, d2, and d3 greater than widths w3 and w4 of the adjacentthird and fourth concave portions 63 and 64. The width d1, d2, and d3 ofthe intermediate convex portions 77, 78, 79 is the smallest width d1 ofthe first intermediate convex portion 77 between the first and secondpattern portions 610 and 620, and the width d3 of the third intermediateconvex portion 79 between the third and fourth pattern portions 630 and640 may be the largest. In this configuration, in consideration of thewidths w1, w2, w3, and w4 and the pitches p1, p2, p3, and p4 of theconcave portions 61, 62, 63, 64, the width d1, d2, and d3 of theintermediate convex portions 77, 78 and 79 may be set.

The optical pattern portion 600C may disposed in the order of a firstpattern portion 610, a second pattern portion 620, a third patternportion 630, and a fourth pattern portion 640 in a first direction X andthe first pattern portion 610, the second pattern portion 620, the thirdpattern portion 630, and may disposed in the order of a first patternportion 610, a second pattern portion 620, a third pattern portion 630and a fourth pattern portion 640 on both sides in the second directionY. Intermediate convex portions 77, 78, and 79 may be disposed betweenthe first to fourth pattern portions 610, 620, 630 and 640,respectively. In each of the first to fourth pattern portions 610, 620,630, and 640, concave portions 61, 62, 63, 64 and convex portions 71,72, 73, and 74 may be alternately disposed in first and seconddirections X and Y. The first pattern portion 610 includes a pluralityof first concave portions 61 and a plurality of first convex portions71, and the width w1 of the first concave portion 61 may be greater thana width the first convex portion 71 disposed between the first concaveportions 61. The second pattern portion 620 includes a plurality ofsecond concave portions 62 and a plurality of second convex portions 72,and the width w2 of the second concave portion 62 may be greater than awidth of the second convex portion 72 disposed between the secondconcave portion 62.

The third pattern portion 630 includes a plurality of third concaveportions 63 and a plurality of third convex portions 73, and the widthw3 of the third concave portion 63 may be smaller than a width of thethird convex portion 73 disposed between the third concave portions 63.The fourth pattern portion 640 includes a plurality of fourth concaveportions 64 and at least one fourth convex portion 74, and the width w4of the fourth concave portion 64 may be smaller than a width of thefourth convex portion 74 disposed between the fourth concave portions64.

Widths w1, w2, w3 and w4 of the first to fourth concave portions 61, 62,63, and 64 may gradually decrease as the distance from the positionoverlapping the center of the light emitting device 300 in the firstdirection X increases. Widths w1, w2, w3 and w4 of the first to fourthconcave portions 61, 62, 63, and 64 may gradually decrease from aposition overlapping with the center of the light emitting device 300 orfrom the center of the optical pattern portion 600 toward both sides ofthe second direction Y. For example, a width of each of the first tofourth concave portions 61, 62, 63, and 64 may satisfy the followingcondition: w1>w2>w3>w4. The width w1 is 0.4 mm or more, for example, inthe range of 0.4 mm to 0.6 mm, the width w2 is less than 0.4 mm, forexample, in the range of 0.32 mm to 0.39 mm, and the width w3 is 0.3 mmor less, for example, in the range of 0.29 mm to 0.38 mm, and the widthw4 may be 0.2 mm or more, for example, in the range of 0.2 mm to 0.28mm. The width w1 of the first concave portion may be at least twice thewidth w4 of the fourth concave portion. The widths d1, d2, and d3 of theintermediate convex portions 77, 78, and 79 may satisfy the followingcondition: d1<d2<d3, and may be a minimum of 0.01 mm or more and amaximum of 0.5 mm or less. That is, the maximum width d3 may be in therange of 0.4 mm to 0.5 mm, and the minimum width d1 may be in the rangeof 0.01 to 0.2 mm. This minimum width d1 may be a range in which concaveportions between the convex portions 77 may be etched or formed. Thedepths h1, h2, and h3 of the first to fourth concave portions 61, 62,63, and 64 are equal to the depths h1 of the third or fourth concaveportions 63 and 64, or the third concave portion 63 may be deeper thanthe four concave portion 64. The depth h1 of the third or fourth concaveportions 63 and 64 may be smaller than the depths h3 and h2 of the firstand second concave portions 61 and 62. A depth h3 of the first concaveportion 61 may be greater than a depth h2 of the second concave portion62.

Depths h3, h2 and h1 of the first to fourth concave portions 61, 62, 63,and 64 as the distance in the first direction X increases with respectto the position overlapping the center of the light emitting device 300may be gradually reduced. Depths h3, h2 and h1 of the first to fourthconcave portions 61, 62, 63, and 64 may be gradually reduced as thedistance from a position overlapping position with the center of thelight emitting device 300 or from the center of the optical patternportion 600C increases toward both sides in the second direction Y. Thedepth h1 of the third and fourth concave portions 63 and 64 may be 0.25mm or more, for example, in the range of 0.25 mm to 0.35 mm. The depthh2 of the second concave portion 62 may be 0.4 mm or more, for example,in the range of 0.4 mm to 0.5 mm. The depth h3 of the first concaveportion 61 may be 0.55 mm or more, for example, in the range of 0.55 mmto 0.65 mm. When an area of the upper surface of the optical patternportion 600 is 100%, an area of the upper surface of the first patternportion 610 may be in the range of 40%±5% compared to an area of theupper surface of the optical pattern portion 600C, and an area of theupper surface of the second pattern portion 620 may be in the range of25%±4% compared to the area of the upper surface of the optical patternportion 600C, and an area of the upper surface of the third patternportion 630 may be in the range of 20%±3% compared to the area of theupper surface of the third optical portion 600C, and an area of theupper surface of the fourth pattern portion 640 may be in the range of15%±3% compared to the area of the upper surface of the optical patternportion 600C.

In the fourth example, the depths h1, h2, and h3 of the optical patternportion 600C having the plurality of pattern portions 610, 620, 630, and640 may provide the deepest at a position overlapping the center of thelight emitting device 300 and the depth gradually decreases as thedistance from the center of the light emitting device 300 increases, andmay be provided with a gradually smaller width as the distance from theoverlapping position with the center of the light emitting device 300increases. Accordingly, in a region adjacent to the light emittingdevice 300, the area and depth of the concave portion 61 of the firstpattern portion 610 is the largest, and the area and depth may bereduced as the concave portion is farther from the light emitting device300, so that patterns capable of diffusing light in proportion to thelight intensity may be disposed.

Here, Table 1 shows examples in which a structure (comparative example)without an optical pattern and the luminance of a module having anoptical pattern portion as in Examples 1 to 3 of the invention werecompared and tested.

TABLE 1 Luminance Comparative Example Example Example (Nit) example 1 23 Minimum  4330  4792  4898  4949 Maximum 77495 87234 90144 101909Intermediate 15141 20458 20599  20564

As in the above experimental examples, since the maximum value of theluminance of the comparative example without the optical pattern is thelowest and the intermediate value of the luminance is also the lowest,the incident light is totally reflected and proceeds into the resinlayer. Since the maximum and intermediate values of the luminance of thefirst example are increased, it may be seen that the amount of totalreflection by the optical pattern portion is reduced, and the lightextraction efficiency is improved. In the luminance of the secondexample, the maximum value may be increased, and the amount of lightemitted from the entire region may be increased. In the luminance of thethird example, the maximum value may be increased, and the amount oflight emitted from the entire region may be increased. Accordingly, evenif a separate light blocking member is not disposed on the resin layerhaving the optical pattern portion, the uniformity of light may beimproved and the amount of transmitted light refracted on the opticalpattern portion may be increased.

FIG. 18(a)(b)(c) shows the directivity distribution of light in Examples1 to 3, and (d) is a view showing the directivity distribution of lightin comparative example without an optical pattern. Here, the fluxdistribution is measured at an angle of 35 degrees with respect to thehorizontal direction passing through the center of the light emittingdevice. In the flux distribution, it may be seen that FIG. 18 (a)(b)(c)is detected at 24 cd or more, and (d) is about 20.5 cd, which is lowerthan the examples of the invention.

FIG. 19 is a plan view of a vehicle to which the lighting deviceaccording to an embodiment of the invention is applied, and FIG. 20 is aview showing an example of a tail lamp of the vehicle of FIG. 19 .

Referring to FIGS. 19 and 20 , a front lamp 850 in the moving object orvehicle 900 may include one or more lighting modules, and control thedriving timing of these lighting modules individually to function as atypical headlamp as well as, when the driver opens the vehicle door,additional functions such as a welcome light or a celebration effect canbe provided. The lamp may be applied to a daytime running lamp, a highbeam, a low beam, a fog lamp or a turn signal lamp. In the vehicle 900,the tail lamp 800 may be arranged with a plurality of lamp units 810,812, 814, and 816 supported by the housing 801. For example, the lampunits 810, 812, 814, and 816 may include a first lamp unit 810 disposedoutside, a second lamp unit 814 disposed around the inner circumferenceof the first lamp unit 810, and third and fourth lamp units 814 and 816respectively disposed on the inside the second lamp unit 814. The firstto fourth lamp units 810, 812, 814, and 816 may selectively apply thelighting device disclosed in the embodiment, and a red lens cover or awhite lens cover for the lighting characteristics of the lamp units 810,812, 814, and 816 on the outside of the lighting device may be placed.The lighting device disclosed in the embodiment applied to the lampunits 810, 812, 814, and 816 may emit surface light in a uniformdistribution. The first and second lamp units 810 and 812 may beprovided in at least one of a curved shape, a straight shape, an angledshape, an inclined shape, and a flat shape, or a mixed structurethereof. One or a plurality of the first and second lamp units 810 and812 may be disposed in each tail lamp. The first lamp unit 810 may beprovided as a tail lamp, the second lamp unit 812 may be provided as abrake lamp, and the third lamp unit 814 may be provided as a reverselamp, and the fourth lamp unit 816 may be provided as a turn signallamp. The structure and position of these lighting lamps can be changed.Such a lighting lamp may provide a higher luminous intensity in a reardirection than in a lateral direction, and thus may comply with lightdistribution regulations such as a stop lamp or a tail lamp.

Features, structures, effects, etc. described in the above embodimentsare included in at least one embodiment of the invention, and are notnecessarily limited to only one embodiment. Furthermore, features,structures, effects, etc. illustrated in each embodiment can be combinedor modified for other embodiments by those of ordinary skill in the artto which the embodiments belong. Accordingly, the contents related tosuch combinations and modifications should be interpreted as beingincluded in the scope of the invention. In addition, although theembodiment has been described above, it is merely an example and doesnot limit the invention, and those of ordinary skill in the art to whichthe invention pertains are exemplified above in a range that does notdepart from the essential characteristics of the present embodiment. Itcan be seen that various modifications and applications that have notbeen made are possible. For example, each component specifically shownin the embodiment can be implemented by modification. And differencesrelated to such modifications and applications should be construed asbeing included in the scope of the invention defined in the appendedclaims.

1. A lighting device comprising: a substrate; a reflective memberdisposed on the substrate; a plurality of light emitting devicesdisposed on the substrate; a resin layer disposed on the reflectivemember and sealing the plurality of light emitting devices; and aplurality of optical pattern portions having a plurality of concaveportions concavely formed on an upper surface of the resin layer,wherein the plurality of light emitting devices is spaced apart in afirst direction in which light is emitted, wherein each of the pluralityof optical pattern portions includes a pattern portion in which a widthof concave portions arranged in the first direction at a positionoverlapping a center of each of the plurality of light emitting devicesis reduced, wherein each of the plurality of optical pattern portionsincludes a pattern portion in which a width of concave portions arrangedtoward both sides of a second direction orthogonal to the firstdirection at the center of the optical pattern portion is reduced,wherein an interval between the plurality of optical pattern portions issmaller than an interval between the plurality of light emittingdevices, and wherein each of the plurality of optical pattern portionshas a maximum length in the first direction smaller than a maximumlength in the second direction.
 2. The lighting device of claim 1,wherein the pattern portion of each of the plurality of optical patternportions comprises two or more pattern portions, and wherein each of thetwo or more pattern portions has a plurality of concave portionsarranged in the first and second directions.
 3. The lighting device ofclaim 2, wherein the each of the two or more pattern portions includes aconvex portion between the plurality of concave portions.
 4. Thelighting device of claim 3, wherein a width of the concave portion in afirst pattern portion adjacent to each of the light emitting devicesamong the two or more pattern portions is greater than a width of theconvex portion.
 5. The lighting device of claim 3, wherein a width ofthe concave portion in a second pattern portion most spaced apart fromthe center of the light emitting device among the two or more patternportions is equal to or smaller than a width of the convex portion. 6.The lighting device of claim 1, wherein the plurality of concaveportions disposed in each of the plurality of optical pattern portionshave the same depth.
 7. The lighting device of claim 1, wherein theplurality of concave portions disposed in each of the plurality ofoptical pattern portions have different depths, and wherein a depth ofconcave portions of a first pattern portion disposed on an upper portionof each of the light emitting devices is a largest among depths of theconcave portions and a depth of concave portions of a second patternportion disposed outside the optical pattern portion is a smallest amongdepths of the concave portions.
 8. The lighting device of claim 1,wherein the concave portions have a shape of a polygonal column or acolumn having a curved surface at a lower portion.
 9. (canceled)
 10. Thelighting device of claim 1, wherein each of the plurality of opticalpattern portions is disposed on an upper portion of each of the lightemitting devices, and wherein an area of the optical pattern portion isin a range of 6 to 18 times an area of an upper surface of each of thelight emitting devices.
 11. The lighting device of claim 1, wherein eachof the plurality of optical pattern portions is spaced apart from anouter side or edge of the resin layer.
 12. A lighting device comprising:a substrate; a reflective member disposed on the substrate; a lightemitting device disposed on the substrate; a resin layer disposed on thereflective member and sealing the light emitting device; and an opticalpattern portion disposed on an upper surface of the resin layer, whereinthe light emitting device emits light in a first direction, wherein theoptical pattern portion includes a plurality of first concave portionsarranged in the first direction and a plurality of second concaveportions arranged in a second direction orthogonal to the firstdirection, wherein each of the plurality of first concave portions andeach of the plurality of second concave portions are concave from theupper surface of the resin layer, wherein widths of the plurality offirst concave portions are decreased toward an edge in the firstdirection at a position overlapping a center of the light emittingdevice, wherein widths of the plurality of second concave portions aredecreased from a center of the optical pattern portion toward both edgesin the second direction, wherein a maximum length of the optical patternportion in the first direction is smaller than a maximum length of theoptical pattern portion in the second direction, and wherein the opticalpattern portion is spaced apart from an outer side or edge of the resinlayer.
 13. The lighting device of claim 12, comprising: a plurality offirst convex portions respectively disposed between the plurality offirst concave portions; and a plurality of second convex portionsrespectively disposed between the plurality of second concave portions.14. The lighting device of claim 13, wherein the plurality of firstconvex portions and the plurality of second convex portions of theoptical pattern portion are connected to each other.
 15. The lightingdevice of claim 13, wherein a width of at least one of the first concaveportions arranged in the first direction is greater than a width of atleast one of the first convex portions.
 16. The lighting device of claim13, wherein a width of at least one of the second concave portionsarranged in the second direction is equal to or smaller than a width ofat least one of the second convex portions.
 17. The lighting device ofclaim 12, wherein a length of a first portion disposed on an upperportion of the light emitting device in the second direction is greaterthan a length of the light emitting device in the second direction. 18.The lighting device of claim 12, wherein the plurality of first andsecond concave portions have the same depth as each other.
 19. Thelighting device of claim 12, wherein at least one of the plurality offirst concave portions or at least one of the plurality of secondconcave portions have different depths.
 20. The lighting device of claim12, wherein the depths of the plurality of first and second concaveportions have the largest concave portions disposed on an upper portionof the light emitting device and the smallest concave portions disposedoutside the optical pattern portion.
 21. The lighting device of claim12, wherein the first and second concave portions have a polygonalcolumnar shape or a columnar shape having a curved surface at a lowerportion, wherein each of the optical pattern portion and the lightemitting device are arranged in plurality in the first direction, andwherein an area of the optical pattern portion is in a range of 6 to 18times an area of the upper surface of the light emitting device.